File xsa435-0-14.patch of Package xen.31430

Overview Repositories Revisions Requests Users Attributes Meta

File xsa435-0-14.patch of Package xen.31430

From d04ae78c34e7e21d9be79301cad7dc085873656a Mon Sep 17 00:00:00 2001
From: Andrew Cooper <andrew.cooper3@citrix.com>
Date: Fri, 10 Mar 2023 15:54:28 +0000
Subject: x86/spec-ctrl: Enumerations for DDP controls

https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/technical-documentation/data-dependent-prefetcher.html

We should offer DDP-CTRL to guests, but I'm not sure when it is appearing in
hardware, and it's not massively urgent - the DDP behaviour is mostly sane
(having been designed in a post-spectre world) and this is a just-in-case
control.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

--- a/tools/libxl/libxl_cpuid.c
+++ b/tools/libxl/libxl_cpuid.c
@@ -227,6 +227,7 @@ int libxl_cpuid_parse_config(libxl_cpuid
         {"intel-psfd",   0x00000007,  2, CPUID_REG_EDX,  0,  1},
         {"ipred-ctrl",   0x00000007,  2, CPUID_REG_EDX,  1,  1},
         {"rrsba-ctrl",   0x00000007,  2, CPUID_REG_EDX,  2,  1},
+        {"ddp-ctrl",     0x00000007,  2, CPUID_REG_EDX,  3,  1},
         {"bhi-ctrl",     0x00000007,  2, CPUID_REG_EDX,  4,  1},
         {"mcdt-no",      0x00000007,  2, CPUID_REG_EDX,  5,  1},
 
--- a/tools/misc/xen-cpuid.c
+++ b/tools/misc/xen-cpuid.c
@@ -202,7 +202,7 @@ static const char *const str_7d1[32] =
 static const char *const str_7d2[32] =
 {
     [ 0] = "intel-psfd",    [ 1] = "ipred-ctrl",
-    [ 2] = "rrsba-ctrl",
+    [ 2] = "rrsba-ctrl",    [ 3] = "ddp-ctrl",
     [ 4] = "bhi-ctrl",      [ 5] = "mcdt-no",
 };
 
--- a/xen/include/public/arch-x86/cpufeatureset.h
+++ b/xen/include/public/arch-x86/cpufeatureset.h
@@ -284,6 +284,7 @@ XEN_CPUFEATURE(LFENCE_DISPATCH,    11*32
 
 /* Intel-defined CPU features, CPUID level 0x00000007:2.edx, word 13 */
 XEN_CPUFEATURE(INTEL_PSFD,         13*32+ 0) /*A  MSR_SPEC_CTRL.PSFD */
+XEN_CPUFEATURE(DDP_CTRL,           13*32+ 3) /*   MSR_SPEC_CTRL.DDP_DIS_U */
 XEN_CPUFEATURE(MCDT_NO,            13*32+ 5) /*A  MCDT_NO */
 
 /* Intel-defined CPU features, CPUID level 0x00000007:1.ecx, word 14 */

Places

File xsa435-0-14.patch of Package xen.31430

Places